Hydraulic jack



nir sfrarrs ra'rnrvr inten REUEL BLACKVOOD, OF PHILADELPHIA,PENNSYLVANIA.

HYDRAULIC JACK.

Speccation of Letters Patent No. 32,612, dated June 25, 1861.

To all whom it may concern:

Be it known that I, Rhein BLAciiwooD, of the city of Philadelphia, inthe State of Pennsylvania, have invented a new and useful Improvement inPortable Hydraulic Lifting-Jacks; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a part of this specification, in which- Figure 1 is a verticallongitudinal section of the said jack; Fig. 2, a like section at rightangles to the plane of section in Fig. l; and Fig. 3, a transversesection through the line .a of Fig. 2: like letters, when on thedifferent figures, indicating the saine parts.

T he nature of my invention consists in the construction and arrangementof certain parts of the machine, substantially in the manner hereinafterdescribed, whereby greater facility is afforded for putting thenecessary parts together and separating them again, in the originalconstructing of the machine and in afterward cleaning, adjusting, andrepairing the same: and also consists in the construction andarrangement of the operating or hand-lever in its relation to the devicefor opening the discharge valve thereby, substantially as hereinafterdescribed.

In the drawings, A, is the base and reservoir for holding the fluidwhich is to be used; B, the main cylinder; C, the plunger or ram; I),the injecting cylinder, and E, its piston; F, the hand-lever whereby thepiston (E) is to be operated; G, the supply and containing valve of theinjecting cylinder; H, the supply and containing valve of the maincylinder, I, the outlet valve; and K and K the lever and stem,respectively, whereby the outlet valve (I) is to be operated.

The hollow cylinders, B and D, are fitted so as to be held securely, andin vertical positions, in a cast-iron support L which screws into themouth of the reservoir (A)-w their respective plungers or pistons, C andE, being fitted to slide up and down therein, in the usual well knownmanner. The bottom of the cylinder B, consists of a disk, m, whichscrews into it andhas a tube n, fixed perpendicularly through itscenter, which has a screwthread around its projecting lower end wherebythe part in which exist the ways 0-0, and the seats of the valves I andH, can be attached or detached by means of a screw nut y). The cylinder'I), and the part D containing the ways (0 0) and valves (G, H, I), arecast in one piece-in this instance-the cylinder portion being securelyheld within the support (L) by means of the shoulder, Q, which abutsagainst the lower side of the support- (L) as seen in Fig. l. rIwoopenings, fitted with screwplugs, ses, are provided in the part (D) soas to be directly above the valves I and H, and through which the lattercan be inserted or taken out as occasion may require. The stem of theoutlet valve (I) projects loosely through the seat thereof into thereservoir, and has around it a spiral spring, t, which tends to keep thevalve shut. The lever K, is jointed to the lower end of the stein of thevalve (I) and has its fulcrum at u, while its power-end extendshorizontally along and under the end of the stem I, which stem restsupon it and is supported so as to slide up and down from the alternateaction of the spring (t) and hand-lever (F). The hand-lever (F) isconnected by its fulcrum to the support (L) by means of a link o, andalso with the piston by means of a cross pin w in the latter and therecess a in the lever, and therefore, can be disconnected with facility.The supply valve (G) is secured by the supply-tube y which screws intothe valve piece (D) and projects downward nearly to the bottom of thereservoir (A), substantially as seen in Fig. l.

Operation: On working the hand-lever (F) up and down, with its recess(as) connected with the pin (w) as seen in Fig. 0, the stem (K) will notbe touched thereby, and the fluid in the reservoir (A) will graduallyand periodically be drawn upward through the valve G and subsequentlyforced, through the ways 0-0 and valve H, into the cylinder B-thusforcing the plunger or ram (C) upward, and lifting and sustainingthereby the object required to be raised. And, for the purpose oflowering the plunger at any time, the operator has only to shift forwardthe lever (F), on the pin fw, unt-il the latter comes against the rearend of the recess (M -thus bringing the lower edge of the lever (F)directly over the projecting upper end of the stem (IC)- and depressingthe latter by means of the former, raise the valve I and allow the fluidto return throughout it from the cylinder B into the reservoir A.

It will be seen, therefore, that the two distinct operationsthe raisingand lowering of the plunger or ram C-can be effected With the greatestfacility, by the operator, with the same lever (F), and that he caninstantly change the direction of motion of the said ram Withoutchanging his hold, or position; and also that all the different parts ofthe machine can be either put together accurately, or taken apart, onthe spot, with perfect facility, by the oper ator; a matter of advantagein constructing, and of great importance in the subsequent cleaning andrepairing of portable hydraulic Jac rs.

Having thus fully described my improved, portable, hydraulic, liftingjack, and pointed out its utility, What I claim as new therein anddesire to secure by Letters Patent is,

l. The construction and arrangement of the cylinder D and the valve-seatpart D together, in the manner described, and in adjustable combinationwith the disk Which forms the removable bottom of the cylinder B, asspecified; the said part (D), 25

containing the valves G, H, I, and the Ways 0-0, all constructed andarranged together so as to -be readily connected or disconnected, asspecified, and to operate substantially in the manner described.

2. Making the open recess (zr), in the hand-lever (F), so as to operatein combination With the pin in the manner described, for the purpose ofallowing greater facility in connecting and disconnecting the 3 saidparts, and also for the. purpose of enabling' the operator either toavoid, or operate, the stem K by means of the said lever, as described,as occasion may require.

REUEL BLACKVOOD.

Witnesses BENJ. Monrsois, JAMES MCCAHEN.

